RGE-Pipeline: Fast Evaluation for LLM-Based Retrieval-Augmented Generation Systems

LU Siyuan; YEERPAN Tuohetiyaer; ZHU Yuye; SHI Yubo; WANG Meiqi; WANG Zhongfeng

doi:10.12263/DZXB.20250372

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RGE-Pipeline: Fast Evaluation for LLM-Based Retrieval-Augmented Generation Systems

PAPERS | 更新时间：2026-05-28

- RGE-Pipeline: Fast Evaluation for LLM-Based Retrieval-Augmented Generation Systems
- ACTA ELECTRONICA SINICA Vol. 54, Issue 2, Pages: 750-764(2026)
- 作者机构：
  
  1.南京大学电子科学与工程学院，江苏南京 210023
  2.南京风语智能信息技术有限公司，江苏南京 210000
  3.南京大学历史学院，江苏南京 210023
  4.中山大学集成电路学院，广东深圳 518107
- 作者简介：
- 基金信息：
  
  Jiangsu Province Major Scientific Project(BG2024032)
- DOI：10.12263/DZXB.20250372
  CLC： TP391.1;TP183
- Received：12 May 2025，
  
  Accepted：24 February 2026，
  
  Published：25 February 2026
- 稿件说明：
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路思远, 叶尔潘·托合提亚尔 , 朱菀晔, 等. 基于大模型的RAG算法的快速评估系统：RGE-Pipeline[J]. 电子学报, 2026, 54(02): 750-764.

LU Siyuan, YEERPAN Tuohetiyaer, ZHU Yuye, et al. RGE-Pipeline: Fast Evaluation for LLM-Based Retrieval-Augmented Generation Systems[J]. Acta Electronica Sinica, 2026, 54(02): 750-764.
路思远, 叶尔潘·托合提亚尔 , 朱菀晔, 等. 基于大模型的RAG算法的快速评估系统：RGE-Pipeline[J]. 电子学报, 2026, 54(02): 750-764. DOI：10.12263/DZXB.20250372

LU Siyuan, YEERPAN Tuohetiyaer, ZHU Yuye, et al. RGE-Pipeline: Fast Evaluation for LLM-Based Retrieval-Augmented Generation Systems[J]. Acta Electronica Sinica, 2026, 54(02): 750-764. DOI：10.12263/DZXB.20250372

摘要

检索增强生成（Retrieval-Augmented Generation，RAG）技术将大语言模型（Large Language Model，LLM）与检索系统相结合，凭借可溯源、可解释、知识更新成本低等优势，已成为LLM落地的主流方案。然而，RAG系统上线前需要经过严苛评估，开发者要构建大规模知识库，并以数千条查询进行全面测试，其间涉及密集检索与反复LLM调用，导致评估耗时极长，严重制约企业级AI的研发迭代效率。为破解这一瓶颈，本文提出RGE-Pipeline（检索器-生成器-评估器流水线）系统，面向基于LLM的RAG算法提供高吞吐、可扩展的快速评估方案。首先，通过预实验对典型RAG系统进行量化分析，定位检索器初始性能瓶颈，引入BM25S替代传统BM25算法，使检索耗时占比降到4%以下，将瓶颈转移至生成与评估阶段。在此基础上，RGE-Pipeline从3个层面进行系统级优化：其一，将评估流程解耦为检索、生成、评估3个模块，引入流水线并行架构，消除串行等待与模型反复加载带来的开销；其二，基于vLLM推理框架设计精细化硬件资源管理方案，支持在同一组GPU上并发部署多个LLM实例；其三，构建数学模型，揭示生成器与评估器之间显存分配比例与系统整体吞吐率的定量关系，并提出3种GPU资源分配策略——显存共享、整卡分配与混合分割，通过平衡两阶段计算负载实现吞吐率最大化。基于CRUD-RAG数据集（涵盖文本续写、摘要生成、多文档问答与幻觉修改等任务，共计6 400条查询）的实验证明，在固定使用BM25S、生成器与评估器均采用Qwen2.5-7B的条件下，RGE-Pipeline展现出显著的加速效果。相比原始串行工作流（耗时约95 h），混合分割方案将总评估时间压缩至1.3 h，加速比达71.7倍；相比模型预加载工作流（耗时约10.8 h），加速比达8.2倍。此外，扩展性实验也表明，RGE-Pipeline在不同知识库规模（18 KB～60 MB）及小规模查询集上均具备良好的适应性。总之，RGE-Pipeline不仅大幅降低了RAG算法的验证成本，还为多LLM并行推理场景的系统优化提供了可借鉴的设计思路。

Abstract

Retrieval-augmented generation (RAG)

which integrates large language model (LLM) with retrieval systems

has become a mainstream solution for LLM deployment due to its advantages in traceability

interpretability

and low cost for knowledge updates. However

before deployment

RAG systems require rigorous evaluation: developers must construct large-scale knowledge bases and conduct comprehensive tests with thousands of queries

involving intensive retrieval computations and repeated LLM calls. This results in extremely time-consuming evaluation processes

severely hindering the development and iteration of enterprise-level AI systems. To address this bottleneck

we propose RGE-Pipeline (Retriever-Generator-Evaluator Pipeline)

a high-throughput

scalable

and fast evaluation framework for LLM-based RAG algorithms. We first conduct preliminary experiments to quantitatively analyze the performance bottlenecks in typical RAG systems

identifying the retriever as the initial bottleneck. By replacing the traditional BM25 algorithm with BM25S

we reduce the retrieval time proportion to below 4%

shifting the bottleneck to the generation and evaluation stages. Building on this

RGE-Pipeline performs system-level optimization from three aspects: (1) decoupling the evaluation workflow into three modules—retriever

generator

and evaluator—and introducing a pipeline parallel architecture to eliminate serial waiting and repeated model loading overhead; (2) designing a fine-grained hardware resource management scheme based on the vLLM inference framework to support concurrent deployment of multiple LLM instances on the same set of GPUs; (3) constructing a mathematical model that reveals the quantitative relationship between the memory allocation ratio of the generator and evaluator and the overall system throughput

proposing three GPU resource allocation strategies—shared VRAM

full-card allocation

and hybrid partitioning—to maximize throughput by balancing the computational load between the two stages. Experiments conducted on the CRUD-RAG dataset

which covers tasks such as text continuation

summarization

multi-document question answering

and hallucination modification with a total of 6 400 queries

demonstrate the significant acceleration achieved by RGE-Pipeline. Under the fixed configuration using BM25S and Qwen2.5-7B for both the generator and evaluator

the hybrid partitioning scheme reduces the total evaluation time from approximately 95 hours (original serial workflow) to 1.3 hours

achieving a speedup of 71.7×

and from approximately 10.8 hours (model-preloading workflow) to 1.3 hours

achieving a speedup of 8.2×. Furthermore

extensibility experiments confirm that RGE-Pipeline maintains strong adaptability across different knowledge base sizes (ranging from 18 KB to 60 MB) and on small-scale query sets. In summary

RGE-Pipeline not only significantly reduces the validation cost of RAG algorithms but also provides a reference design for system optimization in multi-LLM parallel inference scenarios.

关键词

Keywords

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